kyuden

class ProducerConsumer
  KILL = :kill

  def initialize(produce:, consume:, producer_num: 1, consumer_num: 5, max_queue_size: 1000)
    @produce = produce
    @consume = consume
    @consumer_num = consumer_num
    @producer_num = producer_num
    @ids_index = 0
    @max_queue_size = max_queue_size

kyuden

# バックナンバー

### Rubyわくわくナビ

- 2012-66:Bundlerを使いこなす!
- 2012-67:厳選!用途別Ruby/Railsライブラリツール
- 2012-68:データで見るRubyGemsの世界

### 一歩先をゆくRuby

kyuden

// 環境 node v4.1.2
// 実行せず出力結果を記述しなさい
console.log(typeof 'foo');
console.log(typeof new Object());
console.log(typeof undefined);
console.log(typeof new Function('x', 'y', 'return x * y'));
console.log(typeof true);
console.log(typeof /abc/g);
console.log(typeof String('hoge'));
console.log(typeof 10);

kyuden

https://github.com/ledermann/unread

全体像

├── .gemtags
├── .gitignore
├── .tags
├── .tags_sorted_by_file
├── .travis.yml

kyuden

[1] pry(main)> class Base
[1] pry(main)*   cattr_accessor :setting2
[1] pry(main)* end
=> [:setting2]

[2] pry(main)> class Subclass < Base ; end
=> nil
[3] pry(main)> Base.setting2
=> nil
[4] pry(main)> Base.setting2 = true

kyuden

(User.hoges || []).each do |hoge|
  hoge.fuga!
end

kyuden

class MutableConstant
  SERVICE_TYPES1 = ["basic", "premium", "pro"]
  SERVICE_TYPES2 = ["basic", "premium", "pro"].freeze
  SERVICE_TYPES3 = ["basic", "premium", "pro"].map(&:freeze).freeze

  module Defaults
    SERVICE_TYPES1 = ["basic", "premium", "pro"]
    SERVICE_TYPES2 = ["basic", "premium", "pro"].freeze
    SERVICE_TYPES3 = ["basic", "premium", "pro"].map(&:freeze).freeze
  end

kyuden

#!/usr/bin/env ruby

require "webrick"

=begin
    WEBrick is a Ruby library that makes it easy to build an HTTP server with Ruby. 
    It comes with most installations of Ruby by default (it’s part of the standard library), 
    so you can usually create a basic web/HTTP server with only several lines of code.
    
    The following code creates a generic WEBrick server on the local machine on port 1234, 

kyuden

Enumable#grep

レシーバと引数が===と一致するかどうかで絞り込む
# ===で一致するか、ということは==の条件に「範囲ないか」「インスタンス、クラスに属するか」「正規表現に一致するか」は加わったもの

(1..10).grep(2..3)               #=> [2, 3]
%w|a 1 * @|.grep(/[1-9]/)        #=> ["1"]
["a", 1, "&", "@"].grep(Integer) #=> [1]

grepの良い所は条件でしぼりこんだあとにブロックを渡して更に処理ができる

kyuden

Hash#find_all
Hash#select

h = {a: 1, b: 2, c: 3}
h.find_all { |key, value| value.odd? } #=> [[:a, 1], [:c, 3]]
h.select   { |key, value| value.odd? } #=> {:a=>1, :c=>3}

Array#select
Array#select